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n in (-oo:+oo)
n/7 = -4/5 // + -4/5
n/7-(-4/5) = 0
n/7+4/5 = 0
1/7*n+4/5 = 0 // - 4/5
1/7*n = -4/5 // : 1/7
n = -4/5/1/7
n = -28/5
n = -28/5
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